From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B9DAC4361B for ; Fri, 18 Dec 2020 10:22:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 412F923A53 for ; Fri, 18 Dec 2020 10:22:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389059AbgLRKWf (ORCPT ); Fri, 18 Dec 2020 05:22:35 -0500 Received: from mout.gmx.net ([212.227.17.20]:47619 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732938AbgLRKWe (ORCPT ); Fri, 18 Dec 2020 05:22:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1608286851; bh=fKWuu7R0/DAQXyYQ05r+vlyvSs4al0erSCJKH0onFIA=; h=X-UI-Sender-Class:To:Cc:References:From:Subject:Date:In-Reply-To; b=Ko0xDgohW9/Rbo3g1T4O8EVAPvERTh3lxVWu+0TWSp6jDrKBXn9aRGl2gz0FLUwef RzzmqZEPiwLY6VmwK2LAEujR2WIg8796nJ7c+3ix7jAa4rNT3S104Ts2WW5OTlTK3K nbgrhb6/WnilvDDT2PY4Xo840ZwVAUGm5R8Dd5Jw= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [192.168.178.23] ([77.8.212.24]) by mail.gmx.com (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MbAgq-1kEgCh1oNs-00bary; Fri, 18 Dec 2020 11:20:51 +0100 To: Randy Dunlap , jgg@ziepe.ca Cc: Linux Kernel , Linux MM References: <5c172fad-a9cf-c29d-0a27-f2b0505dc33d@infradead.org> From: =?UTF-8?Q?Toralf_F=c3=b6rster?= Subject: Re: 5.10.1: UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:1 Message-ID: <43d52285-a10e-692d-daa6-6f5eb07e3132@gmx.de> Date: Fri, 18 Dec 2020 11:20:47 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <5c172fad-a9cf-c29d-0a27-f2b0505dc33d@infradead.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:TPNQN46B5WgEoZp9vG+bj0t4o69maBowzdifN1O0gn3i4VyTg26 r+vT8yHRC6BroBkV0go2XwZRf5FVncAq3fsX15FbMkR9CaMvky9u97nc4xrmEOvrh/DRG5D sWWenK7UjXll5bwDgvnjrC924ZwgNcvZwhDxmH/MYmkChO+M9JdPbGnLUuIcpQNjbfrTUlv L0d3OdZm2WoovATI9EaYQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:saCbT7iKshk=:HXabUr0uFjAbfO8XeuSUTe qBpKyW8qmFbMAbZmuJa7iW44OOFzaT14Mvvb3ImkjR3KpVBQT4MWQ8UDDGOCyIknwzMl+AOZi A2EaF/JZq4TBTLCm/XFovQmViFui9qgfNVYJzJAn5TVCLW0VLGUYcdxrPRlk7+rEgx457Ekgj wRmMrrg+Eti7GVjxvGha++pPZJ4yEck4pPxiFnTgxMz40yLk4ehXxZ/joJcX3JKkz+WBh5pyw S/4n3MYcG9sVRNc6xccDGPV7QiNspoKrKprAzAIrbk31MA5M3x97VMyeh2PQfvKIl9bKMqDHU TuBnWoalXmLOlWfQR6CCKUHjsN/l/etHdA7RepILLhsrC6GMSZRMz9AVieDUsj5igaqnAyVeQ jMu+2dB4XGcxGAQ4DKLA5/mSGQcrk18/y5zdRp3JNs8sWH7JAvNbt0livRhwnVAZ7lHmvlHrT 4ts4R88ud0L36ng6MDzmz+dLrQYEXgl3CNXQzwuVqbl3PclOexxlvvNXfzMZw/A+MlhWpUEQF TbwdR1sIKOUyMbl1mMuMdT/UXXberx0jMbgNUtILNOX2kYC7a8BwkkatpFzfG/Motbg+G+PTg ofTcKY7T5EkNgDkea3LzgeTHV5tTU5Rmp+C0Zx828bquH4SZ4uxgqg5YtdYDSce/InfW47OGA Qp6NAVwtZckAXxlTZLBKEJv3ugLO03K1FbbrqfVAl0EW/FxrTn45Wzjx9wEfWOnSWqD1WgemL WgPVT9dmfXYrSSGsu3UEg0EdULpEGfX5X91YJ8m4FxEwK8tvvNRcR/Jwwc/HS5Ww7JBfb4gIj pU60mnr7nTlh6zF+07k+Qar9iLW5W0HuTxTBszxReHmZ1/W/EJhjbHsEESHc6Orhpb26t//x8 5I7ekHXSbKCu2hps6R1g== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/18/20 7:54 AM, Randy Dunlap wrote: > Hi, > > [adding linux-mm] > > On 12/16/20 1:54 AM, Toralf F=C3=B6rster wrote: >> Hi, >> >> I got this recently at this hardened Gentoo Linux server: >> >> Linux mr-fox 5.10.1 #1 SMP Tue Dec 15 22:09:42 CET 2020 x86_64 Intel(R) >> Xeon(R) CPU E5-1650 v3 @ 3.50GHz GenuineIntel GNU/Linux >> >> >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206972] >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206977] UBSAN: shift-out-of-bound= s >> in ./include/linux/log2.h:57:13 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206980] shift exponent 64 is too >> large for 64-bit type 'long unsigned int' >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206982] CPU: 11 PID: 21051 Comm: >> cc1 Tainted: G=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 T 5.10.1 #1 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206984] Hardware name: ASUSTeK >> COMPUTER INC. Z10PA-U8 Series/Z10PA-U8 Series, BIOS 3703 08/02/2018 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206985] Call Trace: >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206993]=C2=A0 dump_stack+0x57/0x6= a >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206996]=C2=A0 ubsan_epilogue+0x5/= 0x40 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.206999] >> __ubsan_handle_shift_out_of_bounds.cold+0x61/0x10e >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207002] >> ondemand_readahead.cold+0x16/0x21 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207007] >> generic_file_buffered_read+0x452/0x890 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207011]=C2=A0 new_sync_read+0x156= /0x200 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207014]=C2=A0 vfs_read+0xf8/0x190 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207016]=C2=A0 ksys_read+0x65/0xe0 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207018]=C2=A0 do_syscall_64+0x33/= 0x40 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207021] >> entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207024] RIP: 0033:0x7f01b2df198e >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207026] Code: c0 e9 b6 fe ff ff 5= 0 >> 48 8d 3d 66 c3 09 00 e8 59 e2 01 00 66 0f 1f 84 00 00 00 00 00 64 8b 04 >> 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f >> 84 00 00 00 00 00 48 83 ec 28 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207028] RSP: 002b:00007fff2167e99= 8 >> EFLAGS: 00000246 ORIG_RAX: 0000000000000000 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207030] RAX: ffffffffffffffda RBX= : >> 0000000000000000 RCX: 00007f01b2df198e >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207032] RDX: 0000000000000000 RSI= : >> 00000000054dcc50 RDI: 0000000000000004 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207033] RBP: 00000000054dcc50 R08= : >> 00000000054dcc50 R09: 0000000000000000 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207034] R10: 0000000000000000 R11= : >> 0000000000000246 R12: 00000000054dc3b0 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207035] R13: 0000000000008000 R14= : >> 00000000054c9800 R15: 0000000000000000 >> Dec 15 23:31:51 mr-fox kernel: [ 1974.207037] >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D >> >> >> Known issue ? > > Not that I have heard about, but that's not conclusive. > > Looks to me like this is in mm/readahead.c: > > static unsigned long get_init_ra_size(unsigned long size, unsigned long = max) > { > unsigned long newsize =3D roundup_pow_of_two(size); > > > What filesystem? What workload? / is a 32 GB ext4 filesystem. Data are at 3 BTRFS filesystems, 1x 500 GB and 2x 1.6TB. 2 Tor relays run at 100% each and utilizes the 1 GBit/s by 50%-60% [1] 7 build bots are running over the Gentoo software repostory [2] 1 AFL bot fuzzies the Tor sources. Those 8 jobs are contained by a cgroup of 9 CPUs and 120 GB RAM [3], each job is contained further by an own sub cgroup of 1.5 CPU and 20 GB RAM [4] The host is monitored using sysstat, the load is about 11.8, CPU[all] at 80%, proc/s at 1800, cswchs/s at 20000 and so on. [1] https://metrics.torproject.org/rs.html#search/zwiebeltoralf [2] https://zwiebeltoralf.de/tinderbox.html [3] https://github.com/toralf/tinderbox/blob/master/bin/cgroup.sh [4] https://github.com/toralf/tinderbox/blob/master/bin/bwrap.sh#L15 =2D- Toralf